It is feared that climate change will have very negative effects on human life and the environment. One concern is the availability of food sources. Farmers are starting to see a decline in crop yields due to extreme changes in temperature. Temperature changes reduce both agriculture and crop yields. The heat from global warming will also cause pests to multiply rapidly, which will also lead to fewer crops. Global warming will also make it difficult to provide water to livestock, causing dehydration and mass death in the livestock population. There will also be an increase in water temperatures which will harm fisheries and wild seafood populations. These impacts can threaten human health through malnutrition, food poisoning and disease. It is feared that climate change will have very negative effects on human life and the environment. One concern is the availability of food sources. Farmers are starting to see a decline in some crops due to warmer climates. Both agriculture and fishing depend on certain climatic conditions. While warmer temperatures and CO2 are positive for the growth of some crops in some locations, other conditions such as nutrient levels, soil moisture and available water must be followed. Frequent climate changes make it extremely difficult to grow crops, raise animals and catch fish. Some crops will produce more with more carbon dioxide in the air. There will also be an increase in water temperatures which will harm fisheries and wild seafood populations. Having too much CO2 in the atmosphere will make the oceans more acidic. This is harmful to some fish, such as molluscs (crabs, lobsters, etc.), whose shells can be consumed by acids and even entire ecosystems could be damaged. Global warming will also make it difficult to provide water to livestock, causing dehydration and mass death of the livestock population. If you had double the CO2, you could get 30% more yield from wheat and soybeans, while other crops, like corn, wouldn't increase as much. Part of the problem with global warming is that it usually goes hand in hand with an increase in CO2 in the atmosphere. This could be a potential benefit from global warming, except that if temperatures also rose too much, this would prevent crops from growing. Most plants have an "optimal" temperature level where they will grow really well. So if the temperatures get hot, they will stop growing very well because of this.